CN111841257A - Comprehensive control system and method for ammonia water absorption tower - Google Patents
Comprehensive control system and method for ammonia water absorption tower Download PDFInfo
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- CN111841257A CN111841257A CN202010829407.0A CN202010829407A CN111841257A CN 111841257 A CN111841257 A CN 111841257A CN 202010829407 A CN202010829407 A CN 202010829407A CN 111841257 A CN111841257 A CN 111841257A
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- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 title claims abstract description 143
- 235000011114 ammonium hydroxide Nutrition 0.000 title claims abstract description 143
- 238000010521 absorption reaction Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 17
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Natural products N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 45
- 238000011084 recovery Methods 0.000 claims description 31
- 238000012790 confirmation Methods 0.000 claims description 22
- 230000002159 abnormal effect Effects 0.000 claims description 15
- 229910021529 ammonia Inorganic materials 0.000 claims description 7
- 239000013505 freshwater Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- CVTZKFWZDBJAHE-UHFFFAOYSA-N [N].N Chemical class [N].N CVTZKFWZDBJAHE-UHFFFAOYSA-N 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1412—Controlling the absorption process
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1418—Recovery of products
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
- B01D2257/406—Ammonia
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to an ammonia water absorption tower integrated control system and a method, comprising an ammonia water absorption tower, pipelines, valves, a detection instrument and a control system, and is characterized in that the control system comprises a logic controller, a control analysis unit, an instruction tracking unit, a production instruction execution unit and an alarm instruction execution unit; the logic controller is electrically connected with each valve, the detection instrument and the four units; the comprehensive control method comprises the following steps: step 1, detecting and analyzing ammonia water concentration and ammonia water liquid level signals in the ammonia water absorption tower, sending out a production instruction and an alarm instruction, step 2 receiving the instruction in step 1, executing a control flow according to the instruction, and step 3, respectively analyzing and judging the production instruction execution unit and the alarm instruction execution unit according to related analysis instruction information sent by the instruction tracking unit, and determining the opening and closing degree of each valve and the circulating water pump. Realizing the comprehensive control of the production process of the ammonia water absorption tower.
Description
Technical Field
The invention belongs to the technical field of industrial computer real-time control, and particularly relates to a comprehensive control system and method for an ammonia water absorption tower.
Background
The flue gas pollution discharged by the traditional sintering production is serious, and the main pollutants are sulfur dioxide and nitric oxide. With the gradual strictness of the national emission standards of flue gas, a series of flue gas desulfurization and denitration projects begin to be built. One effective flue gas denitration method is to use ammonia gas as a reducing agent to reduce nitrogen oxides into nitrogen gas and water. The ammonia station system is responsible for producing ammonia, and the waste water discharged in the production process contains high-concentration ammonia nitrogen compounds, and needs to be subjected to secondary treatment processes of ammonia extraction and ammonia water absorption. The main reaction container for absorbing the ammonia water is an ammonia water absorption tower, circulating ammonia water flowing from top to bottom in the tower is contacted with ammonia gas introduced from bottom to top and dissolved, the concentration of the ammonia water is continuously increased in the circulating process, and finally the ammonia water meeting the concentration requirement is recovered. The integrated control system of the on-site ammonia water absorption tower comprises an ammonia water absorption tower, a water inlet switch valve, a circulating water pump, a circulating switch valve, a recovery switch valve, an ammonia water level meter, an ammonia water densimeter and related pipelines. The ammonia water absorption tower is in a tower kettle structure, the middle and upper parts in the tower are ammonia gas and circulating ammonia water contact dissolving areas, and the lower kettle of the tower is an ammonia water storage area. The water inlet switch valve is positioned on a water inlet pipeline at the top of the ammonia water absorption tower and used for controlling the on-off of new water entering the tower. The circulating water pump is connected with the outlet of the circulating pipeline at the bottom of the ammonia water absorption tower and used for pumping the ammonia water at the bottom of the tower to the top of the tower, and one of the two circulating water pumps works and is reserved. And the circulating switch valve is positioned at the inlet of the circulating pipeline at the top of the ammonia water absorption tower and used for controlling the on-off of the circulating ammonia water. The recovery switch valve is positioned on a recovery pipeline of a circulating pipeline branch at the top of the ammonia water absorption tower and used for controlling the on-off of recovered ammonia water. The ammonia water level gauge and the ammonia water densimeter are located at the bottom of the ammonia water absorption tower, the ammonia water level gauge is used for measuring the ammonia water level in the kettle, and the ammonia water densimeter is used for measuring the ammonia water density in the kettle.
The control core of aqueous ammonia absorption tower is the control to aqueous ammonia concentration and aqueous ammonia liquid level in the tower, because at different production stages, aqueous ammonia concentration and aqueous ammonia liquid level have different expression forms, through the analysis and judgment to aqueous ammonia concentration and aqueous ammonia liquid level change, combines the production experience, just can confirm suitable control mode. Traditional aqueous ammonia absorption tower integrated control adopts artifical mode, and this kind of artifical control mode inefficiency, reaction lag judge the error even, and it is unstable often to appear retrieving aqueous ammonia concentration, and the phenomenon that aqueous ammonia liquid level is too low in the tower leads to follow-up production to be influenced, and the aqueous ammonia recovery quality is unqualified.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a comprehensive control system and a comprehensive control method for an ammonia water absorption tower, which realize the comprehensive control of the production process of the ammonia water absorption tower by detecting the density of ammonia water and the liquid level of the ammonia water in the ammonia water absorption tower in real time and comprehensively controlling various pipeline valves and circulating water pumps according to the detection and analysis results.
The purpose of the invention is realized by the following technical scheme:
the invention discloses an ammonia water absorption tower comprehensive control system, which comprises an ammonia water absorption tower, an ammonia gas inlet pipeline, a water inlet switch valve, an ammonia water recovery pipeline, a recovery switch valve, an ammonia water collecting tank and a control system, and is characterized in that the ammonia gas inlet pipeline is arranged in the middle of the ammonia water absorption tower, the water inlet pipeline is arranged at the top of the ammonia water absorption tower, a circulating pipeline is arranged on the side surface of the ammonia water absorption tower, one end of the circulating pipeline is communicated with the bottom of the ammonia water absorption tower, the other end of the circulating pipeline is communicated with the upper part of the ammonia water absorption tower, the circulating pipeline is divided into a lower section, a middle section and an upper section, a circulating water pump is arranged between the lower section and the middle section of the circulating pipeline, the upper section of the circulating pipeline is provided with a circulating switch valve, the lower part of the ammonia water absorption tower is provided with an ammonia water level meter and an ammonia water densimeter, The other end is communicated with an ammonia water collecting tank;
the control system is an intelligent control system and comprises a programmable logic controller, a control analysis unit, an instruction tracking unit, a production instruction execution unit and an alarm instruction execution unit; the input end of the programmable logic controller is connected with the ammonia water level meter and the ammonia water densimeter, the output end of the programmable logic controller is electrically connected with the water inlet switch valve, the circulating water pump, the circulating switch valve and the recovery switch valve, the output end of the programmable logic controller is also connected with the input end of the control analysis unit, the output end of the control analysis unit is connected with the input end of the instruction tracking unit, the output end of the instruction tracking unit is respectively connected with the input end of the production instruction execution unit and the input end of the alarm instruction execution unit, the output end of the instruction tracking unit is also connected with the input end of the control analysis unit, and the output end of the production instruction execution unit and the output end of the alarm instruction execution unit are respectively connected with the input end of the programmable logic.
The invention discloses a comprehensive control method of an ammonia water absorption tower, which adopts the comprehensive control system of the ammonia water absorption tower and is characterized by comprising the following steps:
step 1, controlling an analysis unit to detect and analyze ammonia water concentration and ammonia water level signals in an ammonia water absorption tower and sending analysis instruction information to an instruction tracking unit;
step 2, the instruction tracking unit is used for tracking and confirming the analysis instruction information of the control analysis unit, receiving the analysis instruction information and returning confirmation, and the instruction tracking unit control flow comprises the following specific steps:
step 2.1, the scanning control analysis unit analyzes the instruction information;
step 2.2, when receiving the analysis instruction information of the control analysis unit, sending the confirmation information to the control analysis unit;
step 2.3, when the response confirmation information of the control analysis unit is received, entering step 2.4; when the response confirmation information of the control analysis unit is not received, the step 2.1 is carried out;
step 2.4, receiving response confirmation information of the control analysis unit, and sending execution confirmation analysis instruction information to the control analysis unit;
step 2.5, when the response of the control analysis unit is received, the analysis command information is confirmed, and step 2.6 is carried out; when the response execution confirmation analysis instruction information of the control analysis unit is not received, the step 2.1 is entered;
step 2.6, the analysis instruction information is respectively sent to a production instruction execution unit and an alarm instruction execution unit;
Step 3.1, the concrete steps of analyzing and judging the basis of the production instruction execution unit and implementing control are as follows:
step 3.1.1, in the standby control stage, the system sequentially closes the two circulating water pumps, the circulating switch valve, the water inlet switch valve and the recovery switch valve, and when the equipment is positioned at the target position before being controlled, the equipment is not controlled;
3.1.2, in the cycle absorption control stage, the system sequentially opens a cycle water pump, opens a cycle switch valve, closes a water inlet switch valve and closes a recovery switch valve, and when the equipment is positioned at a target position before being controlled, the equipment is not controlled;
3.1.3, in the ammonia water recovery control stage, the system sequentially opens a circulating water pump, closes a water inlet switch valve, closes a circulating switch valve and opens a recovery switch valve, and when the equipment is positioned at a target position before being controlled, the equipment is not controlled;
3.1.4, in the stage of controlling the water supply, the system sequentially closes the two circulating water pumps, closes the circulating switch valve, closes the recycling switch valve and opens the water inlet switch valve, and when the equipment is positioned at the target position before being controlled, the equipment is not controlled;
step 3.2, the alarm instruction execution unit carries out analysis and judgment according to the three types of alarm instructions, and the concrete steps of implementing control are as follows:
the three types of alarm instructions are respectively as follows: 1) the liquid level of the ammonia water and the concentration of the ammonia water are abnormal in the cyclic absorption control stage; 2) the liquid level of the ammonia water and the concentration of the ammonia water are abnormally alarmed in the ammonia water recovery control stage; 3) the ammonia water liquid level and the ammonia water concentration are abnormal and alarm is given in the fresh water supply control stage;
step 3.2.1, firstly, checking the running state of the circulating water pump, and automatically starting the standby water pump to work if the fault of the jump stop of the circulating water pump occurs; secondly, checking the opening and closing states of the relevant valves, and quickly opening and closing the valves twice to eliminate the blocking phenomenon when the valves are in abnormal states;
3.2.2, the programmable logic controller feeds back the adjustment information of the circulating water pump and the valve to the control analysis unit, and when the abnormal condition is solved, the control analysis unit releases the alarm; when the abnormal condition still exists, the control analysis unit continues to send the alarm instruction, and at the moment, the alarm instruction execution unit performs control adjustment according to a periodic time interval;
and 3.2.3, when major faults occur and the operation needs to be stopped, automatically closing the circulating water pump to operate and closing the related switch valve to ensure the safety of field equipment and personnel.
Compared with the prior art, the invention has the advantages that:
the comprehensive control system adopts the control system as an intelligent control system, controls the analysis unit to detect and analyze the ammonia water concentration and the ammonia water liquid level signal in the ammonia water absorption tower, and sends analysis instruction information to the instruction tracking unit; the instruction tracking unit tracks, confirms and controls the analysis instruction information of the analysis unit, receives the analysis instruction information and returns confirmation; the alarm instruction execution unit carries out analysis and judgment basis and implementation control according to the three types of alarm instructions.
The invention realizes the comprehensive control of the production process of the ammonia water absorption tower by detecting and analyzing the ammonia water liquid level and the ammonia water density in the ammonia water absorption tower in real time and comprehensively controlling valves of all pipelines.
Drawings
FIG. 1 is a schematic view of an integrated control system of an ammonia absorption tower according to the present invention;
FIG. 2 is a block diagram of a computer software system architecture of the present invention;
FIG. 3 is a flow chart illustrating a control process of the production instruction execution unit according to the present invention;
FIG. 4 is a schematic diagram of a control flow of an alarm instruction execution unit according to the present invention.
Detailed Description
In order that the invention may be clearly, fully and completely described, it will be further described in the following detailed description of the preferred embodiments with reference to the accompanying drawings.
As shown in fig. 1 and fig. 2, the ammonia water absorption tower comprehensive control system of the present invention comprises an ammonia water absorption tower 1, an ammonia gas inlet pipeline 2, a water inlet pipeline 3, a water inlet switch valve 4, an ammonia water recovery pipeline 8, a recovery switch valve 9, an ammonia water collection tank 10 and a control system, and is characterized in that the ammonia gas inlet pipeline 2 is arranged in the middle of the ammonia water absorption tower 1, the water inlet pipeline 3 is arranged at the top of the ammonia water absorption tower 1, a circulation pipeline 5 is arranged on the side surface of the ammonia water absorption tower 1, one end of the circulation pipeline 5 is communicated with the bottom of the ammonia water absorption tower 1, the other end is communicated with the upper part of the ammonia water absorption tower 1, the circulation pipeline 5 is divided into three parts, namely a lower section, a middle section and an upper section, a circulation water pump 6 is arranged between the lower section and the upper section of the circulation pipeline 5, a circulation switch valve 7 is arranged on the upper section of the circulation pipeline 5, an ammonia water level meter 11 and an ammonia, one end of the ammonia water recovery pipeline 8 is communicated with the upper section and the middle section of the circulating pipeline 5 through a tee joint, and the other end of the ammonia water recovery pipeline is communicated with the ammonia water collecting tank 10;
the control system is an intelligent control system and comprises a programmable logic controller, a control analysis unit, an instruction tracking unit, a production instruction execution unit and an alarm instruction execution unit; the input end of the programmable logic controller is connected with an ammonia water level meter 11 and an ammonia water densimeter 12, the output end of the programmable logic controller is electrically connected with a water inlet switch valve 4, a circulating water pump 6, a circulating switch valve 7 and a recovery switch valve 9, the output end of the programmable logic controller is also connected with the input end of a control analysis unit, the output end of the control analysis unit is connected with the input end of an instruction tracking unit, the output end of the instruction tracking unit is respectively connected with the input end of a production instruction execution unit and the input end of an alarm instruction execution unit, the output end of the instruction tracking unit is also connected with the input end of the control analysis unit, and the output end of the production instruction execution unit and the output end of the alarm instruction execution unit are respectively connected with the input end of the programmable logic.
As shown in fig. 3 and 4, the method for comprehensively controlling an ammonia water absorption tower according to the present invention employs the above-mentioned system for comprehensively controlling an ammonia water absorption tower, and is characterized by comprising the following steps:
step 1, controlling an analysis unit to detect and analyze ammonia water concentration and ammonia water level signals in an ammonia water absorption tower 1 and sending analysis instruction information to an instruction tracking unit;
step 2, the instruction tracking unit is used for tracking and confirming the analysis instruction information of the control analysis unit, receiving the analysis instruction information and returning confirmation, and the instruction tracking unit control flow comprises the following specific steps:
step 2.1, the scanning control analysis unit analyzes the instruction information;
step 2.2, when receiving the analysis instruction information of the control analysis unit, sending the confirmation information to the control analysis unit;
step 2.3, when the response confirmation information of the control analysis unit is received, entering step 2.4; when the response confirmation information of the control analysis unit is not received, the step 2.1 is carried out;
step 2.4, receiving response confirmation information of the control analysis unit, and sending execution confirmation analysis instruction information to the control analysis unit;
step 2.5, when the response of the control analysis unit is received, the analysis command information is confirmed, and step 2.6 is carried out; when the response execution confirmation analysis instruction information of the control analysis unit is not received, the step 2.1 is entered;
step 2.6, the analysis instruction information is respectively sent to a production instruction execution unit and an alarm instruction execution unit;
Step 3.1, the concrete steps of analyzing and judging the basis of the production instruction execution unit and implementing control are as follows:
step 3.1.1, in a standby control stage, the system sequentially closes two circulating water pumps 6, a circulating switch valve 7, a water inlet switch valve 4 and a recovery switch valve 9, and when the equipment is in a target position before being controlled, the equipment is not controlled;
3.1.2, in the cycle absorption control stage, the system sequentially opens a cycle water pump 6, opens a cycle switch valve 7, closes a water inlet switch valve 4 and closes a recovery switch valve 9, and when the equipment is in a target position before being controlled, the equipment is not controlled;
3.1.3, in the ammonia water recovery control stage, the system sequentially opens a circulating water pump 6, closes a water inlet switch valve 4, closes a circulating switch valve 7 and opens a recovery switch valve 9, and when the equipment is positioned at a target position before being controlled, the equipment is not controlled;
3.1.4, in a fresh water supply control stage, the system sequentially closes the two circulating water pumps 6, closes the circulating switch valve 7, closes the recycling switch valve 9 and opens the water inlet switch valve 4, and when the equipment is positioned at a target position before being controlled, the equipment is not controlled;
step 3.2, the alarm instruction execution unit carries out analysis and judgment according to the three types of alarm instructions, and the concrete steps of implementing control are as follows:
the three types of alarm instructions are respectively as follows: 1) the liquid level of the ammonia water and the concentration of the ammonia water are abnormal in the cyclic absorption control stage; 2) the liquid level of the ammonia water and the concentration of the ammonia water are abnormally alarmed in the ammonia water recovery control stage; 3) the ammonia water liquid level and the ammonia water concentration are abnormal and alarm is given in the fresh water supply control stage;
step 3.2.1, firstly checking the running state of the circulating water pump 6, and automatically starting a standby water pump to work if the circulating water pump 6 has a jump-stop fault; secondly, checking the opening and closing states of the relevant valves, and quickly opening and closing the valves twice to eliminate the blocking phenomenon when the valves are in abnormal states;
step 3.2.2, the programmable logic controller feeds back the adjustment information of the circulating water pump 6 and the valve to the control analysis unit, and when the abnormal condition is solved, the control analysis unit releases the alarm; when the abnormal condition still exists, the control analysis unit continues to send the alarm instruction, and at the moment, the alarm instruction execution unit performs control adjustment according to a periodic time interval;
and 3.2.3, automatically closing the circulating water pump 6 and closing a related switch valve to ensure the safety of field equipment and personnel when major faults need to stop running.
The invention according to the present invention can be carried out in many different ways, and it is possible to obtain a plurality of different embodiments of the invention without any inventive work.
Claims (2)
1. The utility model provides an aqueous ammonia absorption tower integrated control system, includes aqueous ammonia absorption tower, ammonia air inlet pipeline, water intake pipe, the ooff valve of intaking and aqueous ammonia recovery pipeline, recovery ooff valve, aqueous ammonia collection tank and control system, its characterized in that, ammonia air inlet pipeline set up the middle part at the aqueous ammonia absorption tower, and water intake pipe sets up the top at the aqueous ammonia absorption tower, is equipped with the circulation pipeline in the side of aqueous ammonia absorption tower, circulation pipeline one end and aqueous ammonia absorption tower bottom intercommunication, the other end and the upper portion intercommunication of aqueous ammonia absorption tower, the circulation pipeline divide into hypomere, middle section and upper segment triplex, be equipped with circulating water pump between the hypomere and the middle section of circulation pipeline, the upper segment of circulation pipeline be equipped with the circulation ooff valve the lower part of aqueous ammonia absorption tower be equipped with aqueous ammonia level gauge and aqueous ammonia densimeter, recovery pipeline one end through tee bend and circulation pipeline middle section intercommunication on the upper segment and the aqueous ammonia densimeter, The other end is communicated with an ammonia water collecting tank;
the control system is an intelligent control system and comprises a programmable logic controller, a control analysis unit, an instruction tracking unit, a production instruction execution unit and an alarm instruction execution unit; the input end of the programmable logic controller is connected with the ammonia water level meter and the ammonia water densimeter, the output end of the programmable logic controller is electrically connected with the water inlet switch valve, the circulating water pump, the circulating switch valve and the recovery switch valve, the output end of the programmable logic controller is also connected with the input end of the control analysis unit, the output end of the control analysis unit is connected with the input end of the instruction tracking unit, the output end of the instruction tracking unit is respectively connected with the input end of the production instruction execution unit and the input end of the alarm instruction execution unit, the output end of the instruction tracking unit is also connected with the input end of the control analysis unit, and the output end of the production instruction execution unit and the output end of the alarm instruction execution unit are respectively connected with the input end of the programmable logic.
2. The comprehensive control method for the ammonia water absorption tower is characterized by comprising the following steps of:
step 1, controlling an analysis unit to detect and analyze ammonia water concentration and ammonia water level signals in an ammonia water absorption tower and sending analysis instruction information to an instruction tracking unit;
step 2, the instruction tracking unit is used for tracking and confirming the analysis instruction information of the control analysis unit, receiving the analysis instruction information and returning confirmation, and the instruction tracking unit control flow comprises the following specific steps:
step 2.1, the scanning control analysis unit analyzes the instruction information;
step 2.2, when receiving the analysis instruction information of the control analysis unit, sending the confirmation information to the control analysis unit;
step 2.3, when the response confirmation information of the control analysis unit is received, entering step 2.4; when the response confirmation information of the control analysis unit is not received, the step 2.1 is carried out;
step 2.4, receiving response confirmation information of the control analysis unit, and sending execution confirmation analysis instruction information to the control analysis unit;
step 2.5, when the response of the control analysis unit is received, the analysis command information is confirmed, and step 2.6 is carried out; when the response execution confirmation analysis instruction information of the control analysis unit is not received, the step 2.1 is entered;
step 2.6, the analysis instruction information is respectively sent to a production instruction execution unit and an alarm instruction execution unit;
step 3, the production instruction execution unit and the alarm instruction execution unit respectively carry out analysis and judgment according to the related analysis instruction information issued by the instruction tracking unit, determine the opening and closing degree of each valve and the circulating water pump, and then respectively issue related production instructions and alarm instructions to the programmable logic controller
Step 3.1, the concrete steps of analyzing and judging the basis of the production instruction execution unit and implementing control are as follows:
step 3.1.1, in the standby control stage, the system sequentially closes the two circulating water pumps, the circulating switch valve, the water inlet switch valve and the recovery switch valve, and when the equipment is positioned at the target position before being controlled, the equipment is not controlled;
3.1.2, in the cycle absorption control stage, the system sequentially opens a cycle water pump, opens a cycle switch valve, closes a water inlet switch valve and closes a recovery switch valve, and when the equipment is positioned at a target position before being controlled, the equipment is not controlled;
3.1.3, in the ammonia water recovery control stage, the system sequentially opens a circulating water pump, closes a water inlet switch valve, closes a circulating switch valve and opens a recovery switch valve, and when the equipment is positioned at a target position before being controlled, the equipment is not controlled;
3.1.4, in the stage of controlling the water supply, the system sequentially closes the two circulating water pumps, closes the circulating switch valve, closes the recycling switch valve and opens the water inlet switch valve, and when the equipment is positioned at the target position before being controlled, the equipment is not controlled;
step 3.2, the alarm instruction execution unit carries out analysis and judgment according to the three types of alarm instructions, and the concrete steps of implementing control are as follows:
the three types of alarm instructions are respectively as follows: 1) the liquid level of the ammonia water and the concentration of the ammonia water are abnormal in the cyclic absorption control stage; 2) the liquid level of the ammonia water and the concentration of the ammonia water are abnormally alarmed in the ammonia water recovery control stage; 3) the ammonia water liquid level and the ammonia water concentration are abnormal and alarm is given in the fresh water supply control stage;
step 3.2.1, firstly, checking the running state of the circulating water pump, and automatically starting the standby water pump to work if the fault of the jump stop of the circulating water pump occurs; secondly, checking the opening and closing states of the relevant valves, and quickly opening and closing the valves twice to eliminate the blocking phenomenon when the valves are in abnormal states;
3.2.2, the programmable logic controller feeds back the adjustment information of the circulating water pump and the valve to the control analysis unit, and when the abnormal condition is solved, the control analysis unit releases the alarm; when the abnormal condition still exists, the control analysis unit continues to send the alarm instruction, and at the moment, the alarm instruction execution unit performs control adjustment according to a periodic time interval;
and 3.2.3, when major faults occur and the operation needs to be stopped, automatically closing the circulating water pump to operate and closing the related switch valve to ensure the safety of field equipment and personnel.
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| CN208583157U (en) * | 2018-05-25 | 2019-03-08 | 福建久策气体集团有限公司 | A kind of small ammonia water process units |
| CN212396324U (en) * | 2020-08-18 | 2021-01-26 | 中冶北方（大连）工程技术有限公司 | Ammonia water absorption tower integrated control system |
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| JP2003251134A (en) * | 2002-03-06 | 2003-09-09 | Chubu Chemical Kk | Ammonia absorption apparatus and ammonia absorption method used for the same |
| KR100791091B1 (en) * | 2007-02-07 | 2008-01-03 | 한국에너지기술연구원 | Condensation-absorption hybrid tower for simultaneous water vapor condensing and ammonia scrubbing |
| US8486357B1 (en) * | 2012-09-12 | 2013-07-16 | Mitsubishi Heavy Industries, Ltd. | Desulfurization apparatus and method of using condensed water produced therein |
| CN206616035U (en) * | 2017-04-12 | 2017-11-07 | 淮阴工学院 | Ammonia-containing water processing unit |
| CN107051159A (en) * | 2017-05-08 | 2017-08-18 | 内蒙古君正化工有限责任公司 | A kind of chlorine cyclic absorption equipment |
| CN107551837A (en) * | 2017-09-14 | 2018-01-09 | 西安西热电站化学科技有限公司 | One kind improvement is safety-type to match somebody with somebody ammonia device and matches somebody with somebody ammonia method automatically automatically |
| CN208583157U (en) * | 2018-05-25 | 2019-03-08 | 福建久策气体集团有限公司 | A kind of small ammonia water process units |
| CN212396324U (en) * | 2020-08-18 | 2021-01-26 | 中冶北方（大连）工程技术有限公司 | Ammonia water absorption tower integrated control system |
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